Until the end of last year, SNCF, the developer of one of the world's most successful high-speed rail systems, proposed that the state use competitive bidding to partner with it or another foreign operator rather than rely on construction engineers to design a sophisticated network for 200-mph trains.

The approach, the French company said, would help the California High-Speed Rail Authority identify a profitable route, hold down building costs, develop realistic ridership forecasts and attract private investors — a requirement of a $9-billion bond measure approved by voters in 2008.

But SNCF couldn't get its ideas — including considering a more direct north-south route along the Central Valley's Interstate 5 corridor — out of the station.

Instead, the rail authority continued to concentrate planning in the hands of Parsons Brinckerhoff, a giant New York City-based engineering and construction management firm. Although they have occasionally consulted with high-speed railways, officials decided that hiring an experienced operator and seeking private investors would have to wait until after the $68-billion system was partially built.

Earlier this year a pair of Dutch researchers analyzed the passenger market between London and Paris in recent years and found that high-speed rail has been far and away the dominant travel choice in the corridor. Using these findings, they extrapolated that if California's train can make the full trip between Los Angeles and San Francisco in about 3 hours, it will capture roughly a third of business travelers and about 40 percent of the leisure market.

A more recent study, set for publication in the September issue of the journal Transport Policy, suggests that high-speed rail will not only cut into the air market but actually create its own travel demand. The researchers found that more total travelers — air and rail together — existed in various corridors after high-speed rail service began in the country. That means either people saw the service and decided to take trips they otherwise wouldn't have or they shifted from driving to train-riding. The former would be great for California's economy; the latter, a relief to its congested highways.

The change was particularly pronounced in the Barcelona-Madrid corridor. Here the researchers estimate an additional 394,000 travelers in the post-bullet train era — an 8 percent rise from earlier times. That's a good sign for California. The Barcelona-Madrid trip is relatively equidistant to Los Angeles-San Francisco: 314 miles to 348 miles as the crow flies, respectively. The travel time by rail is also comparable, in the neighborhood of 3 hours in each case.

The study also found that opening the Chunnel has shifted travel patterns between the UK and the Continent, getting more people traveling even as fewer people fly.